PS5 Jailbreak lets you play PS2 games from the disc. (Kinda)

[curl-6]

If amateurs can get all this working, you'd expect professionals with the resources of a company like Sony behind them could do it even better.

A box that played PS2, 3, 4, and 5 games could have been a real selling point for the system for longtime gamers who have libraries from those consoles.